main() {
  // 变量
  var name = '张三';
  print(name);
  name = '李四';
  print(name);

  const BASS_URL = 'https://toutiao.itheime.net';
  print(BASS_URL);

  num price = 23;
  print(price);
  price = ((price * 10) * (1.4 * 10)) / 100;
  print(price);

  int index = 0;
  while (index < 10) {
    print(index);
    index++;
  }
  double good_price = 19.99;
  print(good_price);

  price = good_price;
  print(price);

}
